/*
 * Copyright 2002-2007 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
 */

package com.powersi.hygeia.framework.spring;

import java.util.LinkedList;
import java.util.List;

/**
 * Object to represent a SQL parameter definition.
 * 
 * <p>
 * Parameters may be anonymous, in which case "name" is <code>null</code>. However, all parameters must define a SQL type according to {@link java.sql.Types}.
 * 
 * @author Rod Johnson
 * @author Thomas Risberg
 * @author Juergen Hoeller
 * @see java.sql.Types
 */
public class SqlParameter {

    /** The name of the parameter, if any */
    private String name;

    /** SQL type constant from <code>java.sql.Types</code> */
    private final int sqlType;

    /** Used for types that are user-named like: STRUCT, DISTINCT, JAVA_OBJECT, named array types */
    private String typeName;

    /** The scale to apply in case of a NUMERIC or DECIMAL type, if any */
    private Integer scale;

    /**
     * Create a new anonymous SqlParameter, supplying the SQL type.
     * 
     * @param sqlType
     *            SQL type of the parameter according to <code>java.sql.Types</code>
     */
    public SqlParameter(int sqlType) {
        this.sqlType = sqlType;
    }

    /**
     * Create a new anonymous SqlParameter, supplying the SQL type.
     * 
     * @param sqlType
     *            SQL type of the parameter according to <code>java.sql.Types</code>
     * @param typeName
     *            the type name of the parameter (optional)
     */
    public SqlParameter(int sqlType, String typeName) {
        this.sqlType = sqlType;
        this.typeName = typeName;
    }

    /**
     * Create a new anonymous SqlParameter, supplying the SQL type.
     * 
     * @param sqlType
     *            SQL type of the parameter according to <code>java.sql.Types</code>
     * @param scale
     *            the number of digits after the decimal point (for DECIMAL and NUMERIC types)
     */
    public SqlParameter(int sqlType, int scale) {
        this.sqlType = sqlType;
        this.scale = Integer.valueOf(scale);
    }

    /**
     * Create a new SqlParameter, supplying name and SQL type.
     * 
     * @param name
     *            name of the parameter, as used in input and output maps
     * @param sqlType
     *            SQL type of the parameter according to <code>java.sql.Types</code>
     */
    public SqlParameter(String name, int sqlType) {
        this.name = name;
        this.sqlType = sqlType;
    }

    /**
     * Create a new SqlParameter, supplying name and SQL type.
     * 
     * @param name
     *            name of the parameter, as used in input and output maps
     * @param sqlType
     *            SQL type of the parameter according to <code>java.sql.Types</code>
     * @param typeName
     *            the type name of the parameter (optional)
     */
    public SqlParameter(String name, int sqlType, String typeName) {
        this.name = name;
        this.sqlType = sqlType;
        this.typeName = typeName;
    }

    /**
     * Create a new SqlParameter, supplying name and SQL type.
     * 
     * @param name
     *            name of the parameter, as used in input and output maps
     * @param sqlType
     *            SQL type of the parameter according to <code>java.sql.Types</code>
     * @param scale
     *            the number of digits after the decimal point (for DECIMAL and NUMERIC types)
     */
    public SqlParameter(String name, int sqlType, int scale) {
        this.name = name;
        this.sqlType = sqlType;
        this.scale = Integer.valueOf(scale);
    }

    /**
     * Copy constructor.
     * 
     * @param otherParam
     *            the SqlParameter object to copy from
     */
    public SqlParameter(SqlParameter otherParam) {
        // Assert.notNull(otherParam, "SqlParameter object must not be null");
        this.name = otherParam.name;
        this.sqlType = otherParam.sqlType;
        this.typeName = otherParam.typeName;
        this.scale = otherParam.scale;
    }

    /**
     * Return the name of the parameter.
     */
    public String getName() {
        return this.name;
    }

    /**
     * Return the SQL type of the parameter.
     */
    public int getSqlType() {
        return this.sqlType;
    }

    /**
     * Return the type name of the parameter, if any.
     */
    public String getTypeName() {
        return this.typeName;
    }

    /**
     * Return the scale of the parameter, if any.
     */
    public Integer getScale() {
        return this.scale;
    }

    /**
     * Return whether this parameter holds input values that should be set before execution even if they are <code>null</code>.
     * <p>
     * This implementation always returns <code>true</code>.
     */
    public boolean isInputValueProvided() {
        return true;
    }

    /**
     * Return whether this parameter is an implicit return parameter used during the results preocessing of the CallableStatement.getMoreResults/getUpdateCount.
     * <p>
     * This implementation always returns <code>false</code>.
     */
    public boolean isResultsParameter() {
        return false;
    }

    /**
     * Convert a list of JDBC types, as defined in <code>java.sql.Types</code>, to a List of SqlParameter objects as used in this package.
     */
    public static List sqlTypesToAnonymousParameterList(int[] types) {
        List result = new LinkedList();
        if (types != null) {
            for (int i = 0; i < types.length; i++) {
                result.add(new SqlParameter(types[i]));
            }
        }
        return result;
    }

}
